Milan Grygar, Kresba 18 A 17

7", Supraphon Czechoslovakia 1976

Signed. Produced in collaboration with the sound laboratory
of the “ÚTDU ČSAV” Ústav pro teorii a dĕjiny umĕní
Československé akademie vĕd
(Institute for Art Theory and Art History of the
Czechoslovak Academy of Sciences) in Prague.